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This works if you're using the HL10 handset lifter with your CS70. The
HL10 has a built-in microphone to pick up the vibrations from the
ringing of the phone speaker under the handset. The HL10 came with an
accessory package that has an extra round microphone on a cord to help
the lifter if the telephone speaker is located in an out-of-reach
location on the phone. You take that external microphone, plug it into a
jack on the back of the HL10 and let it hang free making sure it's not
resting on any surface. That should eliminate any ringing in your
headset.

We've never dealt with snom wireless adapter but the CS70 and HL10
lifter is a popular set for your phone. there are a couple of things you
can try to cut down on the echo.
1. Make sure CS70 is proper distance from phone, minimum of 6" (12" from a PC)
2. Make sure round compatibility dial (located on left side of base) is
set correctly. Most phones work on setting #1 (never between numbers)3.
Echoing is usually caused by an improper mix of incoming and outgoing
volume. With a friend listening in you can make broad and minor
adjustments for both (incoming: back of base (1-4) and +/- on headset;
outgoing: bottom of base (a-d) and +/- arrows on back of base).
Following these steps should help you out.

If it's not answering the phone, your phone may need to be
programmed for auto-pick up so that it automatically opens the telephone
line when you turn on your headset. Also, make sure the round
compatibility dial (located to the left of the base) is set right (not
between numbers and most phones work on setting #1).

I'm assuming you are using a Plantronics HL10 handset lifter. The
lifer is what notifies your headset that it has an incoming call. Try
turning the ringer volume up on your phone first and see if that solves
the problem. If that does not help, it could be the sensor on the lifter is going out. This could be causing a delay in the response time. The lifter
ships with a ring detector that has a 2.5mm jack on one end and a small
round microphone on the other end. You could try plugging this into the
back of the lifter and setting the microphone next to where the lifter
is mounted on your phone. This might help in picking up the sound of the
phones ring tones. If that doesn't help you might consider replacing
the lifter.

The CS70 headset is definitely paired up to the base and has a good
connection if the lifter raises up, sounds like maybe the compatibility
setting may need adjusting. The number one should be in the three
O'clock position, the compatibility setting is on the left side of the
base unit. Here is a link below for the user guide if you need help
with the adjustment.Plantronics CS70 User's Guide

If the CS70 headset has a charge and beeps when you press the call
control button, you may just need to re-pair or re-subscribe the headset
to the base unit. Here is a link for the pairing / subscription
instructions:

If the headset is not charging, the internal battery may be worn out and
the headset may need to be replaced (the battery is hard wired and is
not replaceable). The replacement headset is model 72910-01. Below is a link where you can purchase the replacement headset.

If the Plantronics CS70N wireless headset is plugged into the headset
jack on your phone, you will need to push the headset button on the
phone and then the call/control button on the wireless headset.

A few things you can do:
1. Make sure that the lifter isn't lifting the phone too high. To change this, look at the back of the lifter, there is a switch that goes from low to high. Make sure that's at the lowest setting.
2. Try a reset. To re-set this unit hold down the minus button on the headset and the call answer button at the same time. Hold them both until you see the orange light by the call answer button flash a few times. It should then go off. If it doesn't go off after 10 seconds release both buttons and push the minus button once more. The light should now be off. Put the headset back in the cradle and try again, it should work now.

Make sure that the power is connected to the headset. You can tell it's connected because there will be a red solid light on the left side of the front of the charging base. Check the power cord for any frays and make sure it's plugged into the wall. If it is, then try the following:
A system reset:
1. Lift the headset off of the base.
2. Make sure the headset is turned off. The green light will not be on on the base.
3. Hold down the minus button at the same time as the call answer button on the headset. Hold them down for at least 10 seconds. An orange light on the headset will flash several times. It should go off when you let go of the buttons. If the orange light stays solid, push the minus button once.
4. Put the headset back in the charging cradle. Leave it for 30 seconds. Lift it back out of the cradle and try using it again.

It's probably a problem with the lifter. Try a re-subscription on the system (refer to user manual). Also make sure that the lifter is lifting the handset far enough off the base so that there isn't much weight pushing it back down. There are 3 settings on the lifter (Look at the knob on the back of the lifter). Low, medium and high. Try setting it to medium.